scholarly journals High-Performance Giant Dielectric Properties of Cr3+/Ta5+ Co-Doped TiO2 Ceramics

ACS Omega ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 1901-1910
Author(s):  
Wattana Tuichai ◽  
Supamas Danwittayakul ◽  
Narong Chanlek ◽  
Masaki Takesada ◽  
Atip Pengpad ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
High Performance ◽  
Doped Tio2 ◽  
Giant Dielectric ◽  
Co Doped

Effects of sintering temperature on microstructure and giant dielectric properties of (V + Ta) co–doped TiO2 ceramics

2017 ◽  
Vol 725 ◽  
pp. 310-317 ◽  
Author(s):  
Wattana Tuichai ◽  
Supamas Danwittayakul ◽  
Narong Chanlek ◽  
Prasit Thongbai
Keyword(s):  
Dielectric Properties ◽  
Sintering Temperature ◽  
Doped Tio2 ◽  
Giant Dielectric ◽  
Co Doped

High-performance giant-dielectric properties of rutile TiO2 co-doped with acceptor-Sc3+ and donor-Nb5+ ions

2017 ◽  
Vol 703 ◽  
pp. 139-147 ◽  
Author(s):  
Wattana Tuichai ◽  
Supamas Danwittayakul ◽  
Narong Chanlek ◽  
Prasit Thongbai ◽  
Santi Maensiri
Keyword(s):  
Dielectric Properties ◽  
High Performance ◽  
Rutile Tio2 ◽  
Giant Dielectric ◽  
Co Doped

Nonlinear current-voltage and giant dielectric properties of Al3+ and Ta5+ co-doped TiO2 ceramics

2019 ◽  
Vol 116 ◽  
pp. 137-142 ◽  
Author(s):  
Wattana Tuichai ◽  
Supamas Danwittayakul ◽  
Narong Chanlek ◽  
Prasit Thongbai
Keyword(s):  
Dielectric Properties ◽  
Doped Tio2 ◽  
Giant Dielectric ◽  
Current Voltage ◽  
Co Doped

scholarly journals Microstructural Evolution and High-Performance Giant Dielectric Properties of Lu3+/Nb5+ Co-Doped TiO2 Ceramics

Molecules ◽  
2021 ◽  
Vol 26 (22) ◽  
pp. 7041
Author(s):  
Noppakorn Thanamoon ◽  
Narong Chanlek ◽  
Pornjuk Srepusharawoot ◽  
Ekaphan Swatsitang ◽  
Prasit Thongbai
Keyword(s):  
Dielectric Properties ◽  
Grain Boundaries ◽  
Dopant Concentration ◽  
Dielectric Behavior ◽  
Second Phase ◽  
Doped Tio2 ◽  
Dielectric Relaxations ◽  
Giant Dielectric ◽  
Second Phase Particles ◽  
Co Doped

Giant dielectric (GD) oxides exhibiting extremely large dielectric permittivities (ε’ > 104) have been extensively studied because of their potential for use in passive electronic devices. However, the unacceptable loss tangents (tanδ) and temperature instability with respect to ε’ continue to be a significant hindrance to their development. In this study, a novel GD oxide, exhibiting an extremely large ε’ value of approximately 7.55 × 104 and an extremely low tanδ value of approximately 0.007 at 103 Hz, has been reported. These remarkable properties were attributed to the synthesis of a Lu3+/Nb5+ co-doped TiO2 (LuNTO) ceramic containing an appropriate co-dopant concentration. Furthermore, the variation in the ε’ values between the temperatures of −60 °C and 210 °C did not exceed ±15% of the reference value obtained at 25 °C. The effects of the grains, grain boundaries, and second phase particles on the dielectric properties were evaluated to determine the dielectric properties exhibited by LuNTO ceramics. A highly dense microstructure was obtained in the as-sintered ceramics. The existence of a LuNbTiO6 microwave-dielectric phase was confirmed when the co-dopant concentration was increased to 1%, thereby affecting the dielectric behavior of the LuNTO ceramics. The excellent dielectric properties exhibited by the LuNTO ceramics were attributed to their inhomogeneous microstructure. The microstructure was composed of semiconducting grains, consisting of Ti3+ ions formed by Nb5+ dopant ions, alongside ultra-high-resistance grain boundaries. The effects of the semiconducting grains, insulating grain boundaries (GBs), and secondary microwave phase particles on the dielectric relaxations are explained based on their interfacial polarizations. The results suggest that a significant enhancement of the GB properties is the key toward improvement of the GD properties, while the presence of second phase particles may not always be effective.

Giant Dielectric Properties of Ga3+–Nb5+ Co-doped TiO2 Ceramics Driven by the Internal Barrier Layer Capacitor Effect

Materialia ◽  
2021 ◽  
pp. 101175
Author(s):  
Wattana Tuichai ◽  
Supamas Danwittayakul ◽  
Jedsada Manyam ◽  
Narong Chanlek ◽  
Masaki Takesada ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Barrier Layer ◽  
Doped Tio2 ◽  
Internal Barrier ◽  
Giant Dielectric ◽  
Internal Barrier Layer Capacitor ◽  
Co Doped

Permittivity boosting in “yellow” (Nb + In) co-doped TiO2

2020 ◽  
Vol 8 (39) ◽  
pp. 13627-13631
Author(s):  
Hiroki Taniguchi ◽  
Daiki Sato ◽  
Akitoshi Nakano ◽  
Ichiro Terasaki
Keyword(s):  
Dielectric Properties ◽  
Doped Tio2 ◽  
Post Annealing ◽  
Co Doped

Unusual effects of post annealing on optical and dielectric properties of (Nb0.5In0.5)0.01Ti0.99O2 (NITO-1.0%) are reported in the present study.

scholarly journals High-performance colossal permittivity materials of (Nb + Er) co-doped TiO2 for large capacitors and high-energy-density storage devices

2016 ◽  
Vol 18 (35) ◽  
pp. 24270-24277 ◽  
Author(s):  
Mei-Yan Tse ◽  
Xianhua Wei ◽  
Jianhua Hao
Keyword(s):  
Dielectric Properties ◽  
Dielectric Loss ◽  
High Performance ◽  
High Energy ◽  
High Energy Density ◽  
Secondary Phases ◽  
Storage Devices ◽  
Low Dielectric ◽  
Colossal Permittivity ◽  
Co Doped

Our work shows contributions to the high-performance dielectric properties, including a CP of up to 104–105 and a low dielectric loss down to 0.03 in (Er0.5Nb0.5)xTi1−xO2 materials with secondary phases.

Raspberry-like mesoporous Co-doped TiO2 nanospheres for a high-performance formaldehyde gas sensor

2021 ◽  
Author(s):  
Qian Rong ◽  
Yuan Li ◽  
Shiqiang Hao ◽  
Songting Cai ◽  
Chris Wolverton ◽  
...  
Keyword(s):  
Gas Sensor ◽  
High Performance ◽  
Daily Life ◽  
Doped Tio2 ◽  
Co Doped

The detection of formaldehyde is closely related to human's daily life.

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